3. A man can row a boat at a speed of 10 km/h is still water. He goes to a certain
point upstream and back to starting point in a river. Speed of flowing river is 2
km/h. What is the average speed of the boat for total journey?
1) 4 km/h 2) 6 km/h 3) 8.4 km/h 4) 9.6 km/h 5) 8.4km/h
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